From 6713f46426c70f601ac33471d16be7b0e1aae349 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Fri, 12 Dec 2025 14:18:13 -0800
Subject: [PATCH] archive/tar, compress/bzip2: base64 some troublesome testdata
 files

This avoids complaints from scanners that look for and open
tar and bz2 files, and complain if they look weird.
In this case, they do look weird, because they are intentionally strange.
This kind of thing shouldn't be necessary, but we already have the machinery
to do it so it's easy enough.

Fixes #76799

Change-Id: Ib302b3aef30108a1325f91fcb2d166f8e1863792
Reviewed-on: https://go-review.googlesource.com/c/go/+/729780
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
---
 src/archive/tar/reader_test.go                |  30 +++--
 src/archive/tar/testdata/gnu-sparse-big.tar   | Bin 5120 -> 0 bytes
 .../tar/testdata/gnu-sparse-big.tar.base64    |  90 +++++++++++++
 src/archive/tar/testdata/neg-size.tar         | Bin 512 -> 0 bytes
 src/archive/tar/testdata/neg-size.tar.base64  |   9 ++
 src/archive/tar/testdata/pax-sparse-big.tar   | Bin 6144 -> 0 bytes
 .../tar/testdata/pax-sparse-big.tar.base64    | 108 +++++++++++++++
 src/archive/tar/testdata/writer-big-long.tar  | Bin 1536 -> 0 bytes
 .../tar/testdata/writer-big-long.tar.base64   |  27 ++++
 src/archive/tar/writer_test.go                |  28 +++-
 src/compress/bzip2/bzip2_test.go              |  12 +-
 .../bzip2/testdata/fail-issue5747.bz2         | Bin 7232 -> 0 bytes
 .../bzip2/testdata/fail-issue5747.bz2.base64  | 127 ++++++++++++++++++
 13 files changed, 414 insertions(+), 17 deletions(-)
 delete mode 100644 src/archive/tar/testdata/gnu-sparse-big.tar
 create mode 100644 src/archive/tar/testdata/gnu-sparse-big.tar.base64
 delete mode 100644 src/archive/tar/testdata/neg-size.tar
 create mode 100644 src/archive/tar/testdata/neg-size.tar.base64
 delete mode 100644 src/archive/tar/testdata/pax-sparse-big.tar
 create mode 100644 src/archive/tar/testdata/pax-sparse-big.tar.base64
 delete mode 100644 src/archive/tar/testdata/writer-big-long.tar
 create mode 100644 src/archive/tar/testdata/writer-big-long.tar.base64
 delete mode 100644 src/compress/bzip2/testdata/fail-issue5747.bz2
 create mode 100644 src/compress/bzip2/testdata/fail-issue5747.bz2.base64

diff --git a/src/archive/tar/reader_test.go b/src/archive/tar/reader_test.go
index fca53dae74..de3d365304 100644
--- a/src/archive/tar/reader_test.go
+++ b/src/archive/tar/reader_test.go
@@ -10,6 +10,7 @@ import (
 	"errors"
 	"fmt"
 	"hash/crc32"
+	"internal/obscuretestdata"
 	"io"
 	"maps"
 	"math"
@@ -25,10 +26,11 @@ import (
 
 func TestReader(t *testing.T) {
 	vectors := []struct {
-		file    string    // Test input file
-		headers []*Header // Expected output headers
-		chksums []string  // CRC32 checksum of files, leave as nil if not checked
-		err     error     // Expected error to occur
+		file     string    // Test input file
+		obscured bool      // Obscured with obscuretestdata package
+		headers  []*Header // Expected output headers
+		chksums  []string  // CRC32 checksum of files, leave as nil if not checked
+		err      error     // Expected error to occur
 	}{{
 		file: "testdata/gnu.tar",
 		headers: []*Header{{
@@ -523,8 +525,9 @@ func TestReader(t *testing.T) {
 		file: "testdata/pax-nul-path.tar",
 		err:  ErrHeader,
 	}, {
-		file: "testdata/neg-size.tar",
-		err:  ErrHeader,
+		file:     "testdata/neg-size.tar.base64",
+		obscured: true,
+		err:      ErrHeader,
 	}, {
 		file: "testdata/issue10968.tar",
 		err:  ErrHeader,
@@ -629,15 +632,24 @@ func TestReader(t *testing.T) {
 	}}
 
 	for _, v := range vectors {
-		t.Run(path.Base(v.file), func(t *testing.T) {
-			f, err := os.Open(v.file)
+		t.Run(strings.TrimSuffix(path.Base(v.file), ".base64"), func(t *testing.T) {
+			path := v.file
+			if v.obscured {
+				tf, err := obscuretestdata.DecodeToTempFile(path)
+				if err != nil {
+					t.Fatalf("obscuredtestdata.DecodeToTempFile(%s): %v", path, err)
+				}
+				path = tf
+			}
+
+			f, err := os.Open(path)
 			if err != nil {
 				t.Fatalf("unexpected error: %v", err)
 			}
 			defer f.Close()
 
 			var fr io.Reader = f
-			if strings.HasSuffix(v.file, ".bz2") {
+			if strings.HasSuffix(v.file, ".bz2") || strings.HasSuffix(v.file, ".bz2.base64") {
 				fr = bzip2.NewReader(fr)
 			}
 
diff --git a/src/archive/tar/testdata/gnu-sparse-big.tar b/src/archive/tar/testdata/gnu-sparse-big.tar
deleted file mode 100644
index 1a5cfc96d92983b42dab09b51bec236fe00d24c3..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 5120
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Lfzc2cx*-4no2;l4

diff --git a/src/archive/tar/testdata/gnu-sparse-big.tar.base64 b/src/archive/tar/testdata/gnu-sparse-big.tar.base64
new file mode 100644
index 0000000000..c25505083b
--- /dev/null
+++ b/src/archive/tar/testdata/gnu-sparse-big.tar.base64
@@ -0,0 +1,90 @@
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diff --git a/src/archive/tar/testdata/neg-size.tar b/src/archive/tar/testdata/neg-size.tar
deleted file mode 100644
index 21edf38cc3c3d98c834d07b6d31e8325898ec492..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 512
zcma)(y$ypf6of6Y0Mc841tQ%uKO%FmLwaN+C{kErtgOKT*}*+|c47w+qNH(i_T6`9
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diff --git a/src/archive/tar/testdata/neg-size.tar.base64 b/src/archive/tar/testdata/neg-size.tar.base64
new file mode 100644
index 0000000000..b7e26a05b1
--- /dev/null
+++ b/src/archive/tar/testdata/neg-size.tar.base64
@@ -0,0 +1,9 @@
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diff --git a/src/archive/tar/testdata/pax-sparse-big.tar b/src/archive/tar/testdata/pax-sparse-big.tar
deleted file mode 100644
index 65d1f8eceb084955d03ef41f6efbbed0ab3ab07d..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 6144
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diff --git a/src/archive/tar/testdata/pax-sparse-big.tar.base64 b/src/archive/tar/testdata/pax-sparse-big.tar.base64
new file mode 100644
index 0000000000..640ef32159
--- /dev/null
+++ b/src/archive/tar/testdata/pax-sparse-big.tar.base64
@@ -0,0 +1,108 @@
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diff --git a/src/archive/tar/testdata/writer-big-long.tar b/src/archive/tar/testdata/writer-big-long.tar
deleted file mode 100644
index 09fc5dd3dd7fc5de3b6d22461fa23152fd499a41..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 1536
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diff --git a/src/archive/tar/testdata/writer-big-long.tar.base64 b/src/archive/tar/testdata/writer-big-long.tar.base64
new file mode 100644
index 0000000000..171d287068
--- /dev/null
+++ b/src/archive/tar/testdata/writer-big-long.tar.base64
@@ -0,0 +1,27 @@
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+MDAwMTc1MAAwMDAwMDAwMDAwMAAxMjMzMjc3MDUwNwAwMzY0NjIAIDAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAdXN0YXIAMDBndWlsbGF1bWUAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAGd1aWxsYXVtZQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMDAwMDAwMAAwMDAwMDAw
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
diff --git a/src/archive/tar/writer_test.go b/src/archive/tar/writer_test.go
index 9e484432ea..759000f6b9 100644
--- a/src/archive/tar/writer_test.go
+++ b/src/archive/tar/writer_test.go
@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"encoding/hex"
 	"errors"
+	"internal/obscuretestdata"
 	"io"
 	"io/fs"
 	"maps"
@@ -74,8 +75,9 @@ func TestWriter(t *testing.T) {
 	)
 
 	vectors := []struct {
-		file  string // Optional filename of expected output
-		tests []testFnc
+		file     string // Optional filename of expected output
+		obscured bool   // Whether file is obscured
+		tests    []testFnc
 	}{{
 		// The writer test file was produced with this command:
 		// tar (GNU tar) 1.26
@@ -151,7 +153,8 @@ func TestWriter(t *testing.T) {
 		//  bsdtar -xvf writer-big-long.tar
 		//
 		// This file is in PAX format.
-		file: "testdata/writer-big-long.tar",
+		file:     "testdata/writer-big-long.tar.base64",
+		obscured: true,
 		tests: []testFnc{
 			testHeader{Header{
 				Typeflag: TypeReg,
@@ -393,7 +396,8 @@ func TestWriter(t *testing.T) {
 					testClose{},
 				},
 			}, {
-				file: "testdata/gnu-sparse-big.tar",
+				file:     "testdata/gnu-sparse-big.tar.base64",
+				obscured: true,
 				tests: []testFnc{
 					testHeader{Header{
 						Typeflag: TypeGNUSparse,
@@ -425,7 +429,8 @@ func TestWriter(t *testing.T) {
 					testClose{nil},
 				},
 			}, {
-				file: "testdata/pax-sparse-big.tar",
+				file:     "testdata/pax-sparse-big.tar.base64",
+				obscured: true,
 				tests: []testFnc{
 					testHeader{Header{
 						Typeflag: TypeReg,
@@ -483,7 +488,7 @@ func TestWriter(t *testing.T) {
 		return x == y
 	}
 	for _, v := range vectors {
-		t.Run(path.Base(v.file), func(t *testing.T) {
+		t.Run(strings.TrimSuffix(path.Base(v.file), ".base64"), func(t *testing.T) {
 			const maxSize = 10 << 10 // 10KiB
 			buf := new(bytes.Buffer)
 			tw := NewWriter(iotest.TruncateWriter(buf, maxSize))
@@ -522,7 +527,16 @@ func TestWriter(t *testing.T) {
 			}
 
 			if v.file != "" {
-				want, err := os.ReadFile(v.file)
+				path := v.file
+				if v.obscured {
+					tf, err := obscuretestdata.DecodeToTempFile(path)
+					if err != nil {
+						t.Fatalf("obscuretestdata.DecodeToTempFile(%s): %v", path, err)
+					}
+					path = tf
+				}
+
+				want, err := os.ReadFile(path)
 				if err != nil {
 					t.Fatalf("ReadFile() = %v, want nil", err)
 				}
diff --git a/src/compress/bzip2/bzip2_test.go b/src/compress/bzip2/bzip2_test.go
index e6065cb43f..13e2d3c1fa 100644
--- a/src/compress/bzip2/bzip2_test.go
+++ b/src/compress/bzip2/bzip2_test.go
@@ -8,8 +8,10 @@ import (
 	"bytes"
 	"encoding/hex"
 	"fmt"
+	"internal/obscuretestdata"
 	"io"
 	"os"
+	"strings"
 	"testing"
 )
 
@@ -22,6 +24,14 @@ func mustDecodeHex(s string) []byte {
 }
 
 func mustLoadFile(f string) []byte {
+	if strings.HasSuffix(f, ".base64") {
+		tf, err := obscuretestdata.DecodeToTempFile(f)
+		if err != nil {
+			panic(fmt.Sprintf("obscuretestdata.DecodeToTempFile(%s): %v", f, err))
+		}
+		f = tf
+	}
+
 	b, err := os.ReadFile(f)
 	if err != nil {
 		panic(err)
@@ -106,7 +116,7 @@ func TestReader(t *testing.T) {
 		}(),
 	}, {
 		desc:  "RLE2 buffer overrun - issue 5747",
-		input: mustLoadFile("testdata/fail-issue5747.bz2"),
+		input: mustLoadFile("testdata/fail-issue5747.bz2.base64"),
 		fail:  true,
 	}, {
 		desc: "out-of-range selector - issue 8363",
diff --git a/src/compress/bzip2/testdata/fail-issue5747.bz2 b/src/compress/bzip2/testdata/fail-issue5747.bz2
deleted file mode 100644
index 2bf2b6ad99f473b6a1b61c5b049eb5be89c61057..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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index 0000000000..a8d510c7a2
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-- 
2.52.0